netdev - Re: [RESUBMIT Patch 1/1] net: replace if()/BUG with BUG

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Date:	Wed, 17 Jun 2015 09:36:11 +0200
From:	Frans Klaver <fransklaver@...il.com>
To:	Maninder Singh <maninder1.s@...sung.com>
Cc:	davem@...emloft.net, willemb@...gle.com, dborkman@...hat.com,
	al.drozdov@...il.com, Al Viro <viro@...iv.linux.org.uk>,
	eyal.birger@...il.com, mst@...hat.com,
	netdev <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	pankaj.m@...sung.com
Subject: Re: [RESUBMIT Patch 1/1] net: replace if()/BUG with BUG_ON

On Wed, Jun 17, 2015 at 6:36 AM, Maninder Singh <maninder1.s@...sung.com> wrote:
> Use BUG_ON(condition) instead of if(condition)/BUG() .
>
> Signed-off-by: Maninder Singh <maninder1.s@...sung.com>
> Reviewed-by: Akhilesh Kumar <akhilesh.k@...sung.com>
> ---
>  net/packet/af_packet.c |    3 +--
>  1 files changed, 1 insertions(+), 2 deletions(-)
>
> diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
> index b5989c6..c91d405 100644
> --- a/net/packet/af_packet.c
> +++ b/net/packet/af_packet.c
> @@ -547,8 +547,7 @@ static void prb_setup_retire_blk_timer(struct packet_sock *po, int tx_ring)
>  {
>         struct tpacket_kbdq_core *pkc;
>
> -       if (tx_ring)
> -               BUG();
> +       BUG_ON(tx_ring);
>
>         pkc = tx_ring ? GET_PBDQC_FROM_RB(&po->tx_ring) :
>                         GET_PBDQC_FROM_RB(&po->rx_ring);

I don't get this. We're not allowed to be using tx_ring, but we can
and do handle it? Does that still warrant a BUG() or BUG_ON()? It's
been in since the function introduction[0]. Can somebody explain?

Thanks,
Frans

[0] f6fb8f100b80 (af-packet: TPACKET_V3 flexible buffer implementation.)
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